elger



(No Model.) 2 Sheets-Sheet 1.

0. A. WELLER.

OLAMPING DEVICE.

No. 351,550. Patented 055. 26, 1886.

I I I A lllllllnnluuifi WITNESSES:

UNITED STATES PATE T FFICE.

CHESTER A. WELLER, OF CROTON LANDING, ASSIGN OR TO OHARLES O. ELGER, OFBROOKLYN, AND WILLIAM D. ELGER, OF NEW YORK, N. Y.

CLAMPING DEVICE.

SPECIFICATION forming part of Letters Patent No. 351,550, dated October26, 1886.

Application filed March 27, i886. Serial No. 196,866. (No model.)

T o whom it may concern.-

Be it known that I, CHESTER A. WELLER, of Oroton Landing, in the countyof \Vestchester and State of New York, have invent ed certain new anduseful Improvements in Clamping Devices, of which the following is aspecification.

The object of my invention is to provide a new and improved clampingdevice,which can be used as a lathe-dog, lathe-chuck, pipe wrench,screw-pipe holder, &c., for holding rods, tubes, bits, and other piecesof machincry.

The invention consists in the combination,

1 with a frame having guides for sliding jaws,of links pivoted to thejaws and to a cross piece through which a screw is passed, which is usedfor adjusting thejaws, all as will be fully described and set forthhereinafter, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a longitudinal'sectional viewof a lathe-dog provided with my improved clamping device. Fig. 2 is aface view of the same, parts being broken out and others in section.Fig. 3 is a cross-sectional view on the line 00 :0, Fig. 1. Fig. 4 is aside view. Fig. 5' is a sectional plan view on the line y y, Fig. 1,Fig. 6 is a longitudinal sectional view of the stock for 0 holding bitsprovided with my improved clamping device. Fig. 7 is asectional view ofa wrench provided with my improved clamping device, and Fig. 8 is adetail sectional view of another construction forthe inner end of thescrew.

Similar letters of reference indicate corre sponding parts.

The casing of frame A is provided with a notch or recess, A, forming twoshanks, B B.

0 Said notch isin the bottom of the frame,which,

for convenience sake, is shown inverted in Fig. 1. In each shank B aninclined guide-groove, O, is formed, in which a sliding jaw, D, ismounted, the jaws being guided by the sides of the groove. To each jaw alink, D, is pivoted, the end of the link being within a suitable recessin each jaw, as shown in Fig. 1, and the other ends of the links arepivoted within slots of a cross-piece, E, mountedto travel in a recess,E, in thecasing A. A screw, F, is passed through an aperture in that endof the casing opposite the one provided with the notch A, and throughthe aperture Fin the closed end of the notch A. The apertures in thecasing A,th rough which the screwF is passed, are not screw-threaded,and the screw can pass through them freely; but the aperturein thecross-piece E is. screw-threaded. The inner end of eachjaw D is providedwith a transverse chiseledge or lip at that surface of the jaw nearestto the open end of the notch or recess A, and from said chisel edge orlip the curve b extends to the side of the jaw opposite to the one atwhich the chisel-edge is formed. This curved surface may be smooth orserrated. The frame A is passed over the rod G or other article to beheld by the dog until the article rests upon the closed end of the notchA, and the screw F is moved in the direction of its length, as indicatedby the arrow a, until the cross-piece E is checked by the jaws strikingagainst the rod G. By thus moving the cross piece E the links D ofthejaws D are brought into the position shown in Fig. 2. By pulling thescrew F in the direction of the arrow at, its inner end is pulled fromthe closed endofthe notch A. The screw F is then turned so as to move inthe inverse direction of the arrow a until its inner end rests againstthe rod G. By continuing the turning of the screw, which can travel nofarther in the inverse direction of the arrow or, asit rests against thebottom of the rod held by the jaws D, the cross-piece E is movedslightly in the direction of the arrow a, whereby the lips orchisel-edges are pressedinto the surface of the rod G, or at least arepressed upon it with sufficient pressure to prevent the slipping of therod G, and the same is thus held securely. When the rod G is to beremoved, the screw F is loosened, so as to permit of moving thecross-piece E in the inverse direction of the arrow or, whereby the jawsD are moved from each other, thus releasing the rod or bar G. The casingA may be provided with any suitable handle.

In the construction shown in Fig. 6 the easing 'or frame is providedwith two opposite handles, J, for turning it, and the sliding jaws Dhave their inner ends rabbeted, so as to overlap; or the edges may bebent or otherwise mounted, so as to overlap more or less. The inner endsof the sliding jaws rest on the block K, having the V-sh'aped notch K,in which block the inner end of the screw F is mounted to turn, theblock being fixed and not adapted to have any movement.

In the construction shown in Fig. 7 but a single handle, J, is provided.At the closed end of the notch A thejaw L is pivoted in the casing, oneedge of said jaw being serrated or toothed and the other edge curved,and facing the inner end of the screw F. If desired, the screw F may beprovided with a head, M, which is so mounted that the screw can turn onit, said head being guided in the frame so as to have a movement in thedirection of the length of the screw F. The head M is provided in itsupper part with a circular or segmental recess adapted to receive therod or tube, as shown in Fig. 8.

The jaws D may in all cases be provided with the lip and chisel edge a,-or they may have segmental recesses fitting on the cylindrical object,such as a rod or tube; or they may be out 01f square, as shown in Fig.6. To hold a reamer or other bit, or a screwrutting die, the screw F isturned so as to move the cross-piece E and the links D in the directionof the arrow d, Fig. 6, whereby the inner ends of the jaws are movedfrom each other, thus forming a recess or cavity for receiving the dieor hit. Then the direction of the rotation of the screw F is reversedfor the purpose of moving the cross-piece E in the inverse direction 01'the arrow d, whereby the jaws are pressed against the walls of thecasing. The casing A is turned by means of the handles J, and the casingmay be used as any other stock or bit holder. Stocks or bits of varioussize can easily be held in the frame, and can be adjusted, fastened, orloosened easily and rapidly.

In the construction shown in Fig. 7, which is a pipe-wrench,and which isturned by means of the handle J, the screw F is turned so as to move inthe inverse direction of the arrow h, to permit thejaw L to swing downinto a cavity in the casing. The tube P is placed on the closed end ofthe notch A, and then the screw F is moved in the inverse direction ofthe arrow h, whereby the cross-piece E is moved in the same directionand the inner ends of the jaws D are pressed against said rod or tube.The screw F is then turned so as to move in the direction of the arrow hand raise the inner end of the serrated jaw L. When the device is turnedin the direction of the arrow m, the serrated edge of the jaw L does notgrip the rod; but when the device is turned in the inverse direction ofthe arrow m the teeth of the jaw L take on the tube or rod P and turnthe same, as indicated by the arrow n, Fig. 7. The parts can be adjustedto hold or release the tube very easily and rapidly, and the devicenever fails to grip the tube or rod.

The device shown in Fig. 8 is merely a modification of that shownin Fig.7, and may be used in a lathe dog or chuck.

Having thus described ntyinvention, I claim as new and desire to secureby Letters Patent- 1. A clamping device consisting of a casing providedwith sliding jaws adapted to slide toward and from each other, across-piece connected by links with said jaws, and a screw passedthrough a screw-threaded aperture in the cross-piece, substantially asshown and described.

2. In a clamping device, the combination, with a casing havingguide-grooves, of sliding jaws in said guide-grooves, a crosspiece,links connecting the cross-piece with the slidingjaws, and a screwpassed through a screwthreaded aperture in the cross piece,substantially as shown and described.

3. In a clamping device, the combination, with the casing havingguide-grooves,of sliding jaws in said grooves, a crosspiece, linksconnected with the cross-piece, a screw passed through a threadedaperture of the crosspiece, which screw is mounted to move freely in thedirection of its length with the crosspiece through which-it is screwedin the casing, substantially as shown and described.

4. [n a clamping device, the combination, with a casing havingguide-grooves, of jaws mounted to slide in said grooves, a crosspiece,links connecting the cross-piece with the sliding jaws, a screw passingthrough a screw-threaded aperture inthe cross-piece, and a head in whichthe inner end of the screw is mounted to turn, substantially as shownand described.

5. In a clamping device, the combination, with the casing, of slidingjaws in the same, a cross-piece, links connecting the crosspiece withthe sliding jaws, a screw passed through a screw-threaded aperture inthe cross-piece, and a handle on the casing, substantially as shown anddescribed.

6. In a clamping device, the sliding jaw D, providedwithachisel-e(lgedlip,a,andacurved recess, 1), 011 the end,substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

CHESTER A VV ELLER.

Vitnesses:

A. H. DYCKMAR, W M. EMENY.

ICC

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